[Hammarlund] HQ-150 Question

[Richard Knoppow]

    I have never heard of doing this, it seems rather draconian. An ohm 
meter should serve to find if there are shorts in the cap and I would 
think running a fairly stiff paint brush through the plates would knock 
off whiskers, etc.
     I would be extremely careful of trying this procedure because you 
might fry something irreplaceable.

     Clear the swamp???

On 7/30/2024 8:58 PM, jthorusen at centcoast.com wrote:
> Greetings to Dan and the Hammarlund list:
> 
>     OK, time for nuclear weapons.   Equipment required:   60 watt or larger
> line isolation transformer.   60 watt dim bulb tester.
> 
>     Procedure:   Carefully disconnect ALL leads to the C1 tuning capacitor.
> Double check this step!   Once you are sure that the capacitor has been
> isolated from all circuitry except chassis ground, connect one output lead
> of the dim bulb tester to chassis ground.   Connect the other lead to the
> offending sections of C1.   This places a 60 watt light bulb (for current
> limiting) in series with the capacitor and an AC line cord.   Plug the AC
> line cord into the isolation transformer and plug the isolation transformer
> into the wall.   Rotate the tuning capacitor back and forth through its
> entire range several times.   Presumably the light bulb will flicker on and
> off at first, and then will remain off as all "whiskers" or other metallic
> contaminents are burned away.   Once you can rotate the tuning cap through
> its entire rangre without any response from the light bulb, un-plug the
> isolation transformer, disconnect the dim bulb circuit and re-connect all of
> the normal connections to C1.   Test for noise.
> 
> Good Luck!
> Jim T.
> KB6GM
> Palus delenda est.

-- 
Richard Knoppow
Los Angeles
WB6KBL
SKCC 19998